2017年6月4日
一.原生实现二维码扫描功能
效果

image.png

1.实现

//  HuScanViewController.h
#import <UIKit/UIKit.h>
@interface HuScanViewController : UIViewController
// 扫描结果 
@property (nonatomic, copy) void (^returnScanBarCodeValue)(NSString * barCodeString);
@end

//  HuScanViewController.m
#import "HuScanViewController.h"
#import <AVFoundation/AVFoundation.h>
#define SCREEN_WIDTH [UIScreen mainScreen].bounds.size.width
#define SCREEN_HEIGHT [UIScreen mainScreen].bounds.size.height
#define TOP (SCREEN_HEIGHT-220)/2
#define LEFT (SCREEN_WIDTH-220)/2

#define kScanRect CGRectMake(LEFT, TOP, 220, 220)
@interface ZFScanViewController ()<AVCaptureMetadataOutputObjectsDelegate>
{
    int num;
    BOOL upOrdown;
    NSTimer * timer;
    CAShapeLayer *cropLayer;
}

/** 输入输出的中间桥梁 */
@property (strong,nonatomic)AVCaptureSession *session;
@property (strong,nonatomic)AVCaptureDevice *device;
@property (strong,nonatomic)AVCaptureDeviceInput *input;
@property (strong,nonatomic)AVCaptureMetadataOutput *output;
@property (strong,nonatomic)AVCaptureVideoPreviewLayer *preview;
/** 扫描支持的编码格式的数组 */
@property (nonatomic, strong) NSMutableArray * metadataObjectTypes;
@property (nonatomic, strong) UIImageView * line;
/** 取消按钮 */
@property (nonatomic, strong) UIButton * cancelButton;

@end

@implementation HuScanViewController

- (NSMutableArray *)metadataObjectTypes{
    if (!_metadataObjectTypes) {
        _metadataObjectTypes = [NSMutableArray arrayWithObjects:AVMetadataObjectTypeAztecCode, AVMetadataObjectTypeCode128Code, AVMetadataObjectTypeCode39Code, AVMetadataObjectTypeCode39Mod43Code, AVMetadataObjectTypeCode93Code, AVMetadataObjectTypeEAN13Code, AVMetadataObjectTypeEAN8Code, AVMetadataObjectTypePDF417Code, AVMetadataObjectTypeQRCode, AVMetadataObjectTypeUPCECode, nil];
        
        // >= iOS 8
        if (floor(NSFoundationVersionNumber) > NSFoundationVersionNumber_iOS_7_1) {
            [_metadataObjectTypes addObjectsFromArray:@[AVMetadataObjectTypeInterleaved2of5Code, AVMetadataObjectTypeITF14Code, AVMetadataObjectTypeDataMatrixCode]];
        }
    }
    
    return _metadataObjectTypes;
}

- (void)viewWillDisappear:(BOOL)animated{
    [super viewWillDisappear:animated];
}

- (void)viewDidLoad {
    [super viewDidLoad];
    
    [self configView];
    [self initViewTitle:@"扫描条形码"];
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    [self setCropRect:kScanRect];
    [self performSelector:@selector(setupCamera) withObject:nil afterDelay:0.3];
}

//  添加遮罩层
- (void)configView{
    UIImageView * imageView = [[UIImageView alloc]initWithFrame:kScanRect];
    imageView.image = [UIImage imageNamed:@"pick_bg"];
    [self.view addSubview:imageView];
    
    upOrdown = NO;
    num =0;
    _line = [[UIImageView alloc] initWithFrame:CGRectMake(LEFT, TOP+10, 220, 2)];
    _line.image = [UIImage imageNamed:@"line.png"];
    [self.view addSubview:_line];
    
    timer = [NSTimer scheduledTimerWithTimeInterval:.02 target:self selector:@selector(lineAnimation) userInfo:nil repeats:YES];
    
    //取消按钮
    CGFloat cancel_width = 100;
    CGFloat cancel_height = 35;
    CGFloat cancel_xPos = (SCREEN_WIDTH - cancel_width) / 2;
    CGFloat cancel_yPos = SCREEN_HEIGHT - cancel_height - 3;
    
    self.cancelButton = [UIButton buttonWithType:UIButtonTypeSystem];
    self.cancelButton.frame = CGRectMake(cancel_xPos, cancel_yPos, cancel_width, cancel_height);
    [self.cancelButton setTitle:@"取消" forState:UIControlStateNormal];
    [self.cancelButton setTintColor:[UIColor whiteColor]];
    [self.cancelButton addTarget:self action:@selector(cancelAction) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:self.cancelButton];
}

- (void)lineAnimation
{
    if (upOrdown == NO) {
        num ++;
        _line.frame = CGRectMake(LEFT, TOP+10+2*num, 220, 2);
        if (2*num == 200) {
            upOrdown = YES;
        }
    }
    else {
        num --;
        _line.frame = CGRectMake(LEFT, TOP+10+2*num, 220, 2);
        if (num == 0) {
            upOrdown = NO;
        }
    }
}

- (void)setCropRect:(CGRect)cropRect{
    cropLayer = [[CAShapeLayer alloc] init];
    CGMutablePathRef path = CGPathCreateMutable();
    CGPathAddRect(path, nil, cropRect);
    CGPathAddRect(path, nil, self.view.bounds);
    
    [cropLayer setFillRule:kCAFillRuleEvenOdd];
    [cropLayer setPath:path];
    [cropLayer setFillColor:[UIColor blackColor].CGColor];
    [cropLayer setOpacity:0.6];
    [cropLayer setNeedsDisplay];
    [self.view.layer addSublayer:cropLayer];
}

// 扫描初始化
- (void)setupCamera{
    AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    if (device==nil) {
        UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"提示" message:@"设备没有摄像头" preferredStyle:UIAlertControllerStyleAlert];
        [alert addAction:[UIAlertAction actionWithTitle:@"确认" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
            
        }]];
        [self presentViewController:alert animated:YES completion:nil];
        return;
    }

    // 获取摄像设备Device
    _device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    
    // 创建输入流Input
    _input = [AVCaptureDeviceInput deviceInputWithDevice:self.device error:nil];
    
    // 创建输出流Output（设置代理 在主线程里刷新）
    _output = [[AVCaptureMetadataOutput alloc]init];
    [_output setMetadataObjectsDelegate:self queue:dispatch_get_main_queue()];
    
    //设置扫描区域
    CGFloat top = TOP/SCREEN_HEIGHT;
    CGFloat left = LEFT/SCREEN_WIDTH;
    CGFloat width = 220/SCREEN_WIDTH;
    CGFloat height = 220/SCREEN_HEIGHT;
    ///top 与 left 互换  width 与 height 互换
    [_output setRectOfInterest:CGRectMake(top,left, height, width)];
    
    //初始化链接对象
    // Session
    _session = [[AVCaptureSession alloc]init];
    [_session setSessionPreset:AVCaptureSessionPresetHigh];
    if ([_session canAddInput:self.input])
    {
        [_session addInput:self.input];
    }
    
    if ([_session canAddOutput:self.output])
    {
        [_session addOutput:self.output];
    }
    
    //设置扫描支持的编码格式(如下设置条形码和二维码兼容)
    _output.metadataObjectTypes = self.metadataObjectTypes;
    _preview =[AVCaptureVideoPreviewLayer layerWithSession:_session];
    _preview.videoGravity = AVLayerVideoGravityResizeAspectFill;
    _preview.frame =self.view.layer.bounds;
    [self.view.layer insertSublayer:_preview atIndex:0];
    
    
    //开始捕获
    [_session startRunning];
}

#pragma mark - AVCaptureMetadataOutputObjectsDelegate
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputMetadataObjects:(NSArray *)metadataObjects fromConnection:(AVCaptureConnection *)connection{
    if (metadataObjects.count > 0) {
        [_session stopRunning];
        [timer setFireDate:[NSDate distantFuture]];
        AVMetadataMachineReadableCodeObject * metadataObject = metadataObjects.firstObject;
        self.returnScanBarCodeValue(metadataObject.stringValue);
        
        if (self.navigationController) {
            [self.navigationController popViewControllerAnimated:YES];
        }else{
            [self dismissViewControllerAnimated:YES completion:nil];
        }
    }
}

#pragma mark - 取消事件
// 取消事件
- (void)cancelAction{
    if (self.navigationController) {
        [self.navigationController popViewControllerAnimated:YES];
    }else{
        [self dismissViewControllerAnimated:YES completion:nil];
    }
}

@end

2.使用

- (void)showScanView:(UIButton *)button
{
    __weak typeof(self) weakself = self;
    HuScanViewController * vc = [[HuScanViewController alloc] init];
    vc.returnScanBarCodeValue = ^(NSString * barCodeString){
        weakself.expressView.textField.text = barCodeString;
    };
    
    self.hidesBottomBarWhenPushed = YES;
    [self.navigationController pushViewController:vc animated:YES];
}

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